Add callback on click example

examples/7_on-click-callback.ipynb

@@ -0,0 +1,114 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 45,
+   "metadata": {
+    "scrolled": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "application/vnd.jupyter.widget-view+json": {
+       "model_id": "1315dd6331db476eb89633478199ff18",
+       "version_major": 2,
+       "version_minor": 0
+      },
+      "text/plain": [
+       "A Jupyter Widget"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "None                                   \r"
+     ]
+    }
+   ],
+   "source": [
+    "from ipyaladin import Aladin\n",
+    "\n",
+    "from ipywidgets import Layout, Box, widgets\n",
+    "\n",
+    "aladin = Aladin(layout=Layout(width='70%'), target='M 36', fov=0.3)\n",
+    "info = widgets.HTML()\n",
+    "\n",
+    "\n",
+    "box_layout = Layout(display='flex',\n",
+    "                    flex_flow='row',\n",
+    "                    align_items='stretch',\n",
+    "                    width='100%')\n",
+    "box = Box(children=[aladin, info], layout=box_layout)\n",
+    "box"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 47,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "import requests\n",
+    "def process_result(data):\n",
+    "    info.value = ''\n",
+    "    ra = data['ra']\n",
+    "    dec = data['dec']\n",
+    "    radius = min(aladin.fov / 10, 5)\n",
+    "    query = \"\"\"SELECT TOP 1 main_id, ra, dec, DISTANCE(POINT('ICRS', %f, %f), POINT('ICRS', ra, dec)) as d FROM basic\n",
+    "               WHERE CONTAINS(POINT('ICRS', ra, dec), CIRCLE('ICRS', %f, %f, %f))=1\n",
+    "               ORDER BY d ASC\"\"\" % (ra, dec, ra, dec, aladin.fov / 10)\n",
+    "    \n",
+    "    r = requests.get('http://simbad.u-strasbg.fr/simbad/sim-tap/sync', params={'query': query, 'request': 'doQuery', 'lang': 'adql', 'format': 'json', 'phase': 'run'})\n",
+    "    obj_name = ''\n",
+    "    obj_coo = None\n",
+    "    obj_data = r.json()['data']\n",
+    "    if len(obj_data)==0:\n",
+    "        return\n",
+    "    \n",
+    "    obj_name = obj_data[0][0]\n",
+    "    obj_coo = [obj_data[0][1], obj_data[0][2]]\n",
+    "        \n",
+    "    sed_img = '<img src=\"http://cdsportal.u-strasbg.fr/cgi-bin/PhotVizPreview/plot?ra=%f&dec=%f&radius_arcsec=5&w=200&h=150&point_size=4\">' % (obj_coo[0], obj_coo[1])\n",
+    "    info.value =  '<h2>%s</h2><br><br>%s' % (obj_name, sed_img)\n",
+    "    \n",
+    "aladin.add_listener('click', process_result)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.6.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}